Rebound stop for straight knitting machines



E. RICHTER Feb.'l6, 1932.

REBOUND STOP FOR STRAIGHT KNITTING MACHINES Filed Dec. 21, 1929 INVENTOR: lvzilflz'cl l} x A TTORNEYS.

Patented Feb. 16, 1932 UNITED STATES PATENT OFFICE EMIL RICHTER, OF 'WYOMISSING, PENNSYLVANIA, ASSIGNOR TO TEXTILE" MACHINE WORKS, OF WYOMISSING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA REBOUND STOP FOR STRAIGHT KNITTING MACHINES Application filed December 21, 1929. Serial No. 415,746.

This invention relates torebound preventing devices for knitting machines and the like.

A11 object of my invention is to provide novel automatic rebound preventing means for machines in which one or more elements are reciprocatively actuated and strike against movement.limiting stops; such for example as the thread carrier rods of straightknitting machines.

Another object is the provision of novel means in a full fashioned stocking knitting machine cooperative with certain of its thread carrier rod control members to accomplish additional control functioning thereof.

The invention comprises the novel elements, features of construction and arrangement of parts in operative relationship, for

attaining the above and other objects, as herein exemplified by one embodiment, while its scope is more particularly pointed out in the appended claims.

Further objects and attendant advantages of the invention will become more readily apparent from the following detailed description, reference being had to the accompanying drawings in which Fig. 1 is a fragmentary rear elevational view of one end of a full fashioned stocking knitting machine having my invention applied thereto.

Fig. 2 is a fragmentary perspective view ofv the plating bar of the machine, the same being swung through an angle of approximately 180 degrees from the position shown in Fig. 1, in order to more clearly show the novel cam elements mounted thereon.

Figs. 3 and l are fragmentary cross-sectional views taken substantially as indicated by thearrows 33 and 4-4 on Fig. 1, and

show certaincam elements in operating position.

Figs. 5 and 6 are diagrammatic illustrations showing the extreme positions of a thread carrier rod in conjunction with its movement limitin and associated control members.

Fig. is an enlarged fragmentary detail view of a thread carrier rod and associated control elements.

Only such well known parts of a full fashioned stocking knitting machine generally involved in and showing the application of the invention have been illustrated; its operation being exemplified in connection with the plating carriers during the forming of the heel tabs.

The usual thread carrier rods 10, having abutment members or dogs 11, are reciprocated in timed relation with the plating bar 12, by the coulier mechanism, not shown.

Common end stops 13 and splicing stops 14 determinedly limit the distance of travel of the carrier rods 10 in accordance with the length of the thread feeding stroke required to obtain desired fabric efi'ects.

It has been found, that when the speed of the machine is increased beyond a certain point during attempts to increase its production, the thread carrier rods 10 which are not controlled by shock or momentum absorbing means, strike against their respective movement limiting stops with such force that the resultant. rebound action becomes excessive, and the well known frictional connection between the carrier rods and the friction rod yields, resulting in untimely retroactive movement of the rods 10 with consequent breakage of needles, sinkers and threads.

To obviate this difiiculty, I provide for additional functioning of certain of the carrier rod control members of the machine, to obtain a latch mechanism which looks the carrier rods'in the present instance the plating carriers-against rebound movement when striking their respective stops.

A carrier rod arresting and releasing crank lever 15, pivotally mounted on a rod 22 and movable in a finished slot of a bearing. member 16, fixed to a spindle moved nut 17, has 90 its rod retaining arm 1501. provided with a square opening through which the dog 11 on the plating carrier 10a passes when the lever is raised, while its other downwardl extending arm 15?; is acted on by a vertically shiftable cam member 18 secured to the free end of a leaf spring 19, fixed to the plating bar 12 at 20.

A similar lever 21 is fulcrumed on the fixed rod 22 and acted on by a cam member 23 which is pivotally mounted in a slot of a bearing 24 adiu bar by screw olts 25. A tension spring '26 normall retains the cam'member 23 in contact wit an abutment edge 27 on the bearmg.

When the platin bar 12 moves to the right as seen in Fig. 1,-t e edge 18a of cam 18 engages the lever arm 15?; and. operates thelever 15 to properly release the plating carrier 10a for movement to the right, (see Fig. 4) On the return stroke of the plating carrier, the lower extremity of lever arm 15b rides on the inclined part 186 of cam 18 and depresses the latter against the action of leaf sprin 19.

A similar but reverse action takes place between lever 21 and cam member 23. When the plating bar moves to the left as seen in Fig. 1, cam edge 23a of cam 23 shifts lever 21 to properly release the plating carrier for movement to the left, while on the return stroke the lever swings the cam member about its ivot against the action of spring 26.

It will noted that each of the cam members 18 and 23 function to actuate the respective levers 15 and 21 only once during each reciprocation or cycle of operation of the plating carrier 10a, for properly releasing the same during its to and fro movement.

The purpose of providin for the periodic inactivity of the cam mem ers 1 8 and 23, is to allow cam edges 11a of the abutment member 11 to engage with and lift the respective levers 15 and 21 when passing thereunder, and permit the latter to drop and Wedge in self adjusting position alon the inclined rear edge 11b of the reboun -abutments 11 simultaneously with the striking of the rod 10a against one of the stops 13 and 14, as the case may be; thereby preventing retroactive movement of the lating carrier.

This action is shown iagrammatically in Figs. 5 and 6; the parts just described being illustrated in their various positions during one cycle of operation of the plating carrier 10a. Fig. 5, shows the rod 10a at the moment it strikes against its end stop 13, and the manner in which it is locked against rebounding by the lever 15, while Fig. 6 shows an abutment member 11 strikin against a stop 14, and the carrier 10a loc ed against rebounding by the lever 21.

Inthis manner, the cam elements 18 and 23 cooperate to properly release the plating stably secured to the plating carrier 10d and time the beginning of its stroke in both directions, while the rod retaining members or arresting levers 15 and '21 function as latches during the inactive machine, which is cooperatively timed to coact in producing desired well known manner.

Of course, the rebound control mechanism herein specifically exemplifed, may be changed and modified in various ways without departing from the invention disclosed, and changes may be necessary and desirable plating effects, in

under certain conditions, it is therefore to be understood that'the invention is not limited to the precise construction and arrangement set forth, but that such changes and alterations may be made as fairly come within the scope of the appended claims.

I claim:

1. In a straight-knitting machine, the combination with a reciprocatively o erated thread carrier rod, and thread carrier rod abutment stops for stopping the rod at each end of its stroke; of a rod retaining lever operative to control the starting time of its stroke, and means on said rod actuating said lever. 4

2. In a straight-knitting machine the combination with a reciprocatively operated thread carrier rod, and thread carrier rod abutment stops for stopping the rod at eachend of its stroke; of a rod retaining member operative to control the starting time of its stroke in one direction, means actuating said member to release the rod, and member 0 crating means on the rod operative on t e return stroke of the same.

3. Ina straight-knitting machine, the combination with a reciprocatively operated threadearrier rod, and thread carrier rod abutment stops for stopping the rod at each' carrier rod an a fixed sto therefor; a .rebound abutment on said rod; and a latch movable by said abutment into a position behind the latter for preventing rebound of said carrier rod after striking said stop.

5. In a straight knitting machine having a reciprocatively operated carrier rod and a fixed stop therefor; a rebound abutment on said rod; a latch movable by said abutment into a position behind the latter for preventing rebound of said carrier rod after striking said stop; and means operated by the rod reciprocative means for raising said latch from looking engagement with said abutment.

In testimony whereof I afiix my signature.

' EMIL RICHTER. 

